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Fix documentation of information_schema.element_types 

The documentation of the columns collection_type_identifier and
dtd_identifier was wrong.  This effectively reverts commits
8e1ccad519 and
57352df66d and updates the name
array_type_identifier (the name in SQL:1999) to
collection_type_identifier.

closes bug #5926
This commit is contained in:
Peter Eisentraut 2011-06-09 07:24:14 +03:00
parent f604891a06
commit e5b50d0ffb
1 changed files with 14 additions and 3 deletions
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17
doc/src/sgml/information_schema.sgml
View File

@ -1876,7 +1876,7 @@
SELECT c.column_name, c.data_type, e.data_type AS element_type
FROM information_schema.columns c LEFT JOIN information_schema.element_types e
ON ((c.table_catalog, c.table_schema, c.table_name, 'TABLE', c.dtd_identifier)
= (e.object_catalog, e.object_schema, e.object_name, e.object_type, e.dtd_identifier))
= (e.object_catalog, e.object_schema, e.object_name, e.object_type, e.collection_type_identifier))
WHERE c.table_schema = '...' AND c.table_name = '...'
ORDER BY c.ordinal_position;
</programlisting>
@ -1936,11 +1936,13 @@ ORDER BY c.ordinal_position;
</row>
<row>
<entry><literal>dtd_identifier</literal></entry>
<entry><literal>collection_type_identifier</literal></entry>
<entry><type>sql_identifier</type></entry>
<entry>
The identifier of the data type descriptor of the array being
described
described. Use this to join with the
<literal>dtd_identifier</literal> columns of other information
schema views.
</entry>
</row>
@ -2094,6 +2096,15 @@ ORDER BY c.ordinal_position;
<entry><type>cardinal_number</type></entry>
<entry>Always null, because arrays always have unlimited maximum cardinality in <productname>PostgreSQL</></entry>
</row>
<row>
<entry><literal>dtd_identifier</literal></entry>
<entry><type>sql_identifier</type></entry>
<entry>
An identifier of the data type descriptor of the element. This
is currently not useful.
</entry>
</row>
</tbody>
</tgroup>
</table>